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(No Model.)A

G. P. GONANT.

SPAGING 'INSTRUMENT FOR DRAWING.

No. 290,210*l Patented Devo. 18, 188,3., -A

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e UNirEE iAfri-.s PATENT EEicE.

GEORGE E. CONA'NT, OE GENEVA LAKE, WISCONSIN, ASSIGNOE OE ONE-l HALE To JOHN E. cONANT, or SAME PLAGE.

SPACING-lNSTRUII/IENT FOR DRAWING.

SPECIFICATION forming part of Letters Patent No. 290,210, dated December 18, 1883.

' i Application tiled April 7, 18588. (No model.)

T i015 whom, it may concern:

Be it known that I, GEORGE I. CONANT, a ci tizcn of theUnited States, residing at Geneva Lake, in the county of Walworth and State of Wisconsin, have invented certain new and useful Improvements in Spacing-Instruments for Drawing, of which the following is a specification, to wit:

'My invention relates to au improvement iu spacing or lining rules and Squares; and it consists in certain peculiarities of construction whereby the device is greatly cheapened, rendered less liable to get out of order, and more certain in its action, Substantially as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operati on, referring to the accompanying drawings, in which- .Figure l is a perspective view of my invention Fig. 2, a longitudinal section of the same; Fig. 3, a modication adapted to space radial lines, and Fig. 1i a detail view.

A represents a rule or square, to the upper side of which is secured an arm, B, which extends out at right angles to the blade A,

and is slotted, as seen atb. This arm is fitted with a sliding box, C, fitting around the arm and provided with a .piece7 C, working in the slot b, and having flanges c c, which overlap the upper Surface of the arm and hold the two together. Upon this piece C is secured a thumb-rest, G2, and in the forward end of the arm B is a finger-socket, b', which are used as will be presently explained.

D is a slide having a slot, d, and arranged just over the Slot b in the armV B, and just in rear of the piece C. This slide is-adjustably secured to the rear end of the arm B by means of a screw and thumb-nut, D, as shown.

It will be readily understood that when the slide D is drawn back and secured in any position the box C is free to have a limited movement upon the arm B equal to the distance the piece G may slide back without abutting against the slide D.

In operation the blade is laid upon the paper in any position desired, and the thumb placed in the rest C and one iinger in the socket b. After drawing a line along the edge of the blade A it is held in place by the pressure of the finger, while the thumb draws back the box C as far as the slide D will allow. The pressure is then transferred to the thumb, and the blade is drawn back until it rests against the box, and a second line drawn. This operation is repeated, and every line will be exactly parallel with the first and exactly the same space between them.

If desired, the blade A may be swiveled to the arm B and the pivot provided with a small pointer adapted to indicate the angle to which the blade may be turned and set, as seen by Fig. 4, and may be varied and set as desired, and the device will be found very convenient for section-lining, or any other use where accurate spacing is desired. The arrangement described may be applied to the head of a T- square with equal effect.

In Fig. 3 is shown a modification adapted to space lines radiating from a common center. In this case the arm B, box C, and slide D are all formed on the are of a circle whose center is at some point upon the front edge of the blade A, and when used as before described the box and arm will be drawn around in a circle, and the lines drawn by the edge of the blade will be found to radiate from a common center and as accurately spaced as when parallel.

It is obvious that instead of a slotted slide, D, a screw might be used, held in a lug upon the arm B, and having'its point acting as a stop for thepiece C.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a spacing-instrument, a ruling-blade provided with a slotted arm having an adjustable gage and a iinger-hold, in combination with a box in which the slotted arm moves, provided with a projection engaging with and moving in said slot, and having a thumbhold, substantially as and for the purpose set fort-h.

2. In a spacing-instrument, the blade A, arm B, having slot b and sockeb b', and the iesence of two Witnesses. adjustable slotted slide or gage D, adapted In testimony Wliereof I affix my signature in 1o to be set at any point desired, in combination l`\- GEORGE I. CONANT. with the box C, provided with anged piece G', Working in the slotted arm, and the thulnblflnesses:

CHARLES S. FRENCH,

socket C, all constructed and arranged to op- P. L. KELLEY;

crate substantially as and for the purpose set forth. l 

